Reflector for quartz lamps



F. GIRARD REFLECTOR FOR QUARTZ LAMPS June 21 1927. 1,633,525

Filed Aug. 24, 1921 2 Sheets-Sheet l June 21 1927.

F". GIRARD REFLECTOR FOR QUARTZ LAMPS Filed Aug. 24, 1921 2 Sheets-Sheet 2 Patented June 21, 1927.

, UNITED STATES rnrrz GIRABD, ,or nAn u-oN rIts-Marn, "G RM Y.

REFLECTOR ron A TZ ramrs.

. Application filedl August a4, 1321, Serial naaaeesa, and ineermai r b ar z, 1919,

(GRANTED unnnarnnraovrs ons or rnsacror 1 4mm, 1,921, 41 srAr.,L.,.1a13,

My invention relatestoirradiation quartz lamps for medical purposes and more especially to lamps. havinga parabolic cylindrical metal reflector. Such lamps heretofore involvedjthe drawback thatthe utilization of the; light was rather .imperfect 0wing to insuflicient reflection bythe lamp casing serving mainly as a light screen. It is an object of my invention to provide a lamp in which the entire radiation of a quartz lampfor medical purposes isthoroughly utilized in a comparatively narrow bundle of light rays which however, for the. particular purpose is large enough,

Up till now the use of a metal reflector in the form of a paraboliccylinder on account of the dimensions of the lamp at the pole vessels required reflectors of comparatively great focal length. which had an opening of unsuitably great width and greatdispersion, thatmeans a very large bundle of light of limited intensity.

. According to my invention, now, I-utilize only that part of a parabolic cylindrical reflector, the curvature of which is flat while the more strongly curved portion at the vertex of the'pa'rabola by which'it is formed, is replaced by a small reflector of quartz glass, porcelain or some other suitable refractory material, which is disposed nearer to, the source of light and is also shaped like a parabolic cylinder. This reflector of quartz glass. which can, be placed .veryclose to the arc, can have. a very short focal'length and although being" comparatively small (as required on account of; the costs of quartz glass) is capable of taking up the light which heretofore was radiated to the rear and practically not utilized at all'up toa half circle and somewhat more and reflected to the frontto be utilized then.

I am aware that it is not new per se to provide lamps with a reflector in two parts,

the-outer part being made of metal. I Such reflectors are well known in head lights for motor cars, but here they serve a different purpose and besides do'not fulfill the condition of the outer part having a great and the inner as small a focal length as possible. Moreover the inner part in the old reflectors is not made of quartz glass or the like, a feature, which allows to reduce the emitting opening of the reflector while the source of light, is surrounded ;to a, large extent Lb'y the inner reflector. V

'A special modification of the new reflector is characterized .by theparabolic central portion consistingofquart being subdivided intov two-portions with an air gap between them of a width equal to the thickness of thegarc, that is, about 4; mm. Although the reflection at the. vertex is thereby abolished,

this gap does not inany appreciable extent detract from theeftect, as the light reflected at this pointv is forv the greater part, unable to passthrough the arc. On the other. hand,

th-isair gap is of particuIarIvaluefor. the

cooling of the quartz lamp and the reflector itself. The-gapsformed between the small and t-he largereflector. are also advantageous on account of the comparatively small surfaces which are available for the abduction of heat. They increase thecirculation of air and consequentlythe abduction ofv heat, which is indispensable t'orthe successful. operation of quartz lamps. v

.Preferably, the new reflector consisting of parts, is possible, to substitute its parabolic halves by. approximate halves of a cylinder.

This does notaflect the efliciency to-any appreciable extent butgreatly facilitates manufacture.

In the drawings affixed to-this specification and forming part thereof, a lamp embodying my invention is illustrated diagrammatically by way of example. In the drawings;

. Fig. lisa cross section and Fig. 2a longitudinal section of my improved reflector.

Fig. 3 is a side view of the device, and

Fig. 4 is a like view showing the reflector in tilted position.

a is a quartz lamp, 7) the inner part, which consists of quartz, and c the outer'metallic part of the reflector. The inner part has the focal length f, the outer part the focal length 9 as follows from the parabola shown in dotted lines. For comparison, a reflector d is shown in dotted lines in order to indi cate the radiation opening required by a several parts is sodesigned, that its outer 7 part is formed of two plane metal mirrors.

reflector made exclusively of metal, the focal length h of which were adapted to the pole vessel dimensions of the quartz lamp. In

the reflector 6, having. the focal-lengthi- (also .shown in dotted lines) the clearance for tilting the quartz lamp is considered, if the lamp should be adapted to be tilted within the reflector in order to igniteit. This tilting of the lamp can be effected according to my invention together with the reflector which, owing to the small dimensions and the limited weight of the reflector has no detrimental consequences for the quartz lamp.

This is shown in Figs. 3 and 4, the metallic reflector 0 being pivoted at m to the free end of a screw spindle is provided with a crank handle Z and extending through a nut o pivoted to the support 79, to which the reflector is pivoted at a and which is capable of turning about a horizontal spindle q housed in the cross arm of the standard, thereby allowing the lamp to betilted in a vertical plane for purposes of ignition.

.reflector can consequently be radiated upwards, downwards and laterally as required. I wish it to be understood that. I..do not desire to belimited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

11 claim: I

1. Irradiating device comprising a reflector of refractory material, a quartz lamp near the focus of said refractory reflector and a second reflector, said refractoryrq' flector being. arranged to reflect the rearwardly emitted rays, said second reflector the forwards emitted. rays of said lamp, said second reflector having a greater focal length than said refractory reflector.

2. Irradiating device comprising areflector of refractory material, a quartz lamp nearthe focus of said refractory reflector and a second reflector, said refractory re-- flectorbeing made of quartz glass and arranged to reflect the rearwardly emitted rays, said second reflector the forwardly said refractory reflector.- p

3. Irradiating device comprising a reflector ofrefractory material and formed in two parts separated by a gap, a quartz lamp near the focus ofsaid refractory reflector and a second reflector, said refractory reflector being arranged to reflect the rearwardly emitted rays, said second reflector emitted rays of said lamp, said second reflector having a greater focal length than A the forwardly emitted rays of said lamp,"

said second reflector having a greater focal length than said refractory reflector;

l. Irradiating device comprising a reflector of refractory material, a quartz lamp near the focus of said refractory-reflector and a second reflector formed of two sub stantially flat portions, said refractory re flector being arranged to reflect the rearwardly em tted rays, said second reflector the forwardly emitted rays of said lamp,

said second reflector having a greater focal length than said refractory reflector.

5. Irradiating device comprising a reflector of refractory materiaL'a quartz lamp near the focus of said refractory reflector and a second reflector formed of two substantially flat portions and arranged to be tilted about a horizontal axis, said refractory 'reflector beingarranged to reflect the rearwardly emitted rays, said second reflector the forwardly emitted rays of said lamp, said second reflector having a greater focal length than said refractory reflector.

6. Irradiating device for medical purposes.

comprising in combination, two plane mirrors converging towards their rear ends, but

separated by a gap two reflecting sections of cylinders of refractory material disposed intermediate said mirrors and separated also by a gap and a quartz lamp tube in the focus of said cylinder sections and extending sub:

stantially in parallel with the gap separating them.

In testimony whereof I affix my signature. 7

FRITZ sinner). 

